Rework types for logic function (#18074)

## Summary

- **Consolidate logic function services**: Remove
`LogicFunctionMetadataService` and consolidate all logic function CRUD
operations into `LogicFunctionFromSourceService`, with a new
`LogicFunctionFromSourceHelperService` for shared validation/migration
logic
- **Introduce typed conversion utils following the skill pattern**: Add
`fromCreateLogicFunctionFromSourceInputToUniversalFlatLogicFunctionToCreate`
and `fromUpdateLogicFunctionFromSourceInputToFlatLogicFunctionToUpdate`
that convert DTO inputs directly to flat entities
(`UniversalFlatLogicFunction` / `FlatLogicFunction`), replacing the
previous intermediate `UpdateLogicFunctionMetadataParams` indirection
- **Simplify `CodeStepBuildService`**: Remove ~100 lines of manual
duplication logic by delegating to
`LogicFunctionFromSourceService.duplicateOneWithSource`
- **Remove completed 1-17 migration**: Delete
`MigrateWorkflowCodeStepsCommand` and associated utils that migrated
workflow code steps from serverless functions to logic functions

packages/twenty-server/src/engine/metadata-modules/logic-function/logic-function.module.ts

@@ -17,7 +17,7 @@ import { WorkspaceManyOrAllFlatEntityMapsCacheModule } from 'src/engine/metadata
 import { LogicFunctionLayerModule } from 'src/engine/metadata-modules/logic-function-layer/logic-function-layer.module';
 import { LogicFunctionEntity } from 'src/engine/metadata-modules/logic-function/logic-function.entity';
 import { LogicFunctionResolver } from 'src/engine/metadata-modules/logic-function/logic-function.resolver';
-import { LogicFunctionMetadataService } from 'src/engine/metadata-modules/logic-function/services/logic-function-metadata.service';
+import { LogicFunctionFromSourceHelperService } from 'src/engine/metadata-modules/logic-function/services/logic-function-from-source-helper.service';
 import { LogicFunctionFromSourceService } from 'src/engine/metadata-modules/logic-function/services/logic-function-from-source.service';
 import { WorkspaceFlatLogicFunctionMapCacheService } from 'src/engine/metadata-modules/logic-function/services/workspace-flat-logic-function-map-cache.service';
 import { PermissionsModule } from 'src/engine/metadata-modules/permissions/permissions.module';
@@ -43,11 +43,11 @@ import { WorkspaceMigrationModule } from 'src/engine/workspace-manager/workspace
     SecretEncryptionModule,
   ],
   providers: [
-    LogicFunctionMetadataService,
+    LogicFunctionFromSourceHelperService,
     LogicFunctionFromSourceService,
     LogicFunctionResolver,
     WorkspaceFlatLogicFunctionMapCacheService,
   ],
-  exports: [LogicFunctionMetadataService, LogicFunctionFromSourceService],
+  exports: [LogicFunctionFromSourceService],
 })
 export class LogicFunctionModule {}